I have just hit the movie button on the back and this is what I got out of the camera.
The sound despite it having a little echo from the room wasn't bad at all and perfectly usable for this type of video. I would want an off camera mic for something more important though.
Unfortunately the camera lacks anyway of using an External microphone, the Mark 2 did have a horseshoe mount that supported a mic input. In the grand scheme of things, this doesn't bother me too much as off camera sound is easy enough to marry up with the video in post if it is really needed.
It was set to 25fps using the AVCHD 25p 24M (FX)
I will try out the XAVCS format one I have I card that can handle it, my current SD Card isn't compatible.